ABSTRACTS OF TECHNICAL ARTICLES 1259 



same crystals. The effect of cooling rate on magnetostriction was found to 

 be substantial only in the composition range 70 to 80 per cent nickel. When 

 the specimens are quenched, Xm goes through zero for a nickel content just 

 below 80 per cent nickel, a composition very close to that for highest per- 

 meability. This is understandable because the magnetostrictive strain caused 

 by movement of the boundary between two domains, each magnetized spon- 

 taneously in a [HI] direction, depends on Xm alone. The same physical pic- 

 ture predicts that near 45 percent nickel, where [100] is the direction of 

 easiest magnetization and Xioo goes through zero, the permeability versus 

 composition curve should again have a maximum. Such a maximum is known 

 to exist, and initial permeabilities as high as 15,000 have been observed. 

 Although simple theory suggests that domain-rotation should occur in very 

 weak fields when the crystal anisotropy is very small (75 per cent nickel in 

 quenched alloys), nevertheless, rotation involves magnetostrictive strains 

 which prevents mo from becoming infinite. Internal poles are also likely to 

 be formed. In slowly cooled alloys the anisotropy is zero at about G3 per 

 cent nickel; here there are random strains caused by magnetostriction and 

 possibly also by atomic ordering. The principal changes in magnetic prop- 

 erties with composition are explained in terms of the crystal anisotropy and 

 magnetostriction, and their change with heat treatment. 



BOZORTH, R. M} 



Behavior of Magnetic Materials, Am. J. Phys., 21, pp. 260-266, 

 Apr., 1953 (IMonograph 2105). 



This is a review of recent work in which the atomic theory of ferromagnetism 

 and the domain theory of magnetization are applied to new materials. . 



BozoRTH, R. M., see H. J. Williams. 



Burns, R. M.^ 



Science and Scientists in Telecommunications, Electrochem. See. 

 J., 100, pp. 90C-94C, Apr., 1953. 



CoLLEY, R. H., see G. Q. Lumsden 



Coy, J. A.,^ and E. K. Van Tassel^ 

 Type-0 Carrier Telephone, Elec. Eng., 72, pp. 418-423, May, 1953. 



The Type-0 carrier is an economical short-haul carrier system especially 

 suitable for use under 150 miles. It fulfills the same purpose for open-wire 

 lines as the Type-N carrier system does in cable routes. Numerous laboratory 

 tests have indicated that good service standards have been maintained in 

 spite of its low cost. 



Bell Telephone Laboratories. 



